<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>lesson 23</title>
    <style>

    </style>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="root"></div>
</body>

</html>
<script>
    // 过度，动画
    const app = Vue.createApp({
        data() {
            return {
                styleObj: {
                    background: 'blue'
                }
            };
        },
        methods: {
            handleClick() {
                if (this.styleObj.background === 'blue') {
                    this.styleObj.background = 'green';
                } else {
                    this.styleObj.background = 'blue';
                }
            }
        },
        template: `
        <div>
            <div class="transtion" :style="styleObj">hello world</div>
            <button @click="handleClick">切换</button>
        </div>
        `
    });

    const vm = app.mount("#root")
</script>